174 



The Florists^ Review 



Dbcbmbkb 15, 1921 



of air valves, but avoid the bother of 

 frequently testing them to make sure 

 that the system is free from air. 



The principal advantage of running 

 the flow pipe downhill, after carrying it 

 to the highest point in the system as 

 quickly as possible, is that the circula- 

 tion of the water in a hot water system 

 depends upon the fact that cold water 

 is heavier than hot water, and the 

 greater weight of the cold water re- 

 sults in its traveling back through the 

 returns, forcing the hot and lighter 

 water in the boiler out into the flow 

 pipes. The hot water does not rise nat- 

 urally in the pipes, except as it is pushed 

 out of the way by the heavier cold 

 water. A hot water system is something 

 like a wheel, supported so that it will 

 swing freely. If of the same weight at 

 all points, it will remain stationary, but 

 if any portion of the wheel has more 

 weight than the remainder of the wheel, 

 it will revolve until the heaviest portion 

 is at the bottom. 



In a hot water system, the water in 

 the pipes between the highest point of 

 the system and the boiler on one side, 

 and the water between the highest point 

 and the boiler on the other side, will be 

 balanced against each other. Everything 

 else being equal, the tendency to circu- 

 late will be in proportion to the temper- 

 ature of the water, which will really de- 

 termine the weight of the water on the 

 opposite sides of the highest point in 

 the system. So far as the present ques- 

 tion is concerned, the size and length of 

 the pipes makes no difference, although 

 the higher the point at which the water 

 cools, the greater will be the tendency 

 to circulate. 



Now to return to the point in 

 question, "Why is it better to have 

 the highest point in the system near the 

 heater?" The nearer it is to the heater, 

 the less opportunity for the water to 

 cool; if the flow runs uphill through the 

 house, the amount of cooling will be in- 

 creased and, as this will take place on 

 the warm side of the system, it will 

 tend to retard circulation. 



Since the flow pipes are generally 

 larger than the returns, the actual effect 

 will not be great, but if the piping on 

 both sides were of the same size and 

 with the same number of feet, the cir- 

 culation would be greatly impeded. Of 

 course, the uphill system will circulate, 

 but, for the reasons given above, it is ad- 

 visable to run the flow pipes downhill. 



In the earlier days of hot water heat- 

 ing, 4-inch cast iron pipes were used, 

 and it was generally more convenient 

 to run the flow pipes parallel to and 

 on the same level or over the returns. 



The downhill system has been used for 

 more than thirty years and it is found 

 equal to the uphill piping in every way, 

 and superior in the points mentioned. 



PIPE — Second-Hand 



All sizes Fittings and Boiler Tubes 



Pipe cut 

 to sketch 



We guarantee entire satisfac- 

 tion or money refunded 



PhOadelphia Second Hand Pipe Supply Co. 



1003 N. 7th Street, PHILADELPHIA, PA. 



PIPE AND FLUES ^J^ilL^i 



pipe, with new threads and couplings, in 

 random lengths or cut lengths. Also make a 

 specialty of handling boiler flues for retub- 

 ing boilers or for greenhouse piping. All 

 flues are trimmed and thoroughly cleanea by 

 machine. JOHN GROH 

 1885 Clyboarn Ave. CHICAGO. ILI.. 



Do You Know 



that our nearest representative is ready to 

 serve you in every way possible? Whatever 

 your boiler setting troubles, he will make 

 them his study and show you how to remedy 

 them with 



On Tour of Investigation. 



FURNACE LINING 



PLIBRICO is a plastic furnace lining, easily 

 applied, that when molded into baffles, side 

 walls, bridge walls, and front and back 

 arches, and properly baked and vitrified, 

 has remarkable strength and durability, 

 outlasting laid-up fire brick many times. 



Ask for our booklet D-46 on "Modern Furnacev'Building.". 



PUBRICO b de- 

 lirerMl obIt !■ (led 

 coaUinen of db- 

 tiactiTe appear- 

 ■ace u tkowB at 

 ihericlit. Ware- 

 house stocks in 

 all principal 

 cities. 



IMICO 



Hot Water Boilers 



Made by 



lUinois Malleable Iron Co. 



1801-1825 Divercey Boulevard 



CHICAGO 



Are noted for COAL ECONOMY and 

 good results generally 



SEND FOR CATALOGUE 



^ 



# 



% 



BOILER FLUES 



We make a opeclaltyof handling 

 carefully selected boiler flues, 4 

 Inches In diameter and other sizes 

 for Retahlne Boilers. Also 

 Flues for Rreenhouse piplni;, etc. 



All floes are thoroughly cleaned 

 Inside and out, trimmed and are 

 readyforuse. General salosaeent 

 for Sfuftle's Patent Clamp and Kl- 

 bow for Jolnlntr flues— no pacKlnff, 

 no leaks NewStjindard Pipe and 

 all kinds of Oreenhouse FIttlntrs. 

 Rtfrht prices and prompt shipment. 



THE H. MUNSON CO., 

 Est. 189i<. Inc. 1921. 



Phone State 646S, 6«M 

 938 W. North Ave. Chicago / 



% 



at 



10 



PIPE- 



Wrought Iron of sound second-hand Quality 

 with new threads and cjupling, 16- ft. lengths 

 and up. Also pipe cut to sketch. We guarantee 

 entire satisfaction or return money. 



ALSO NEW PIPE AND FITTINGS 



Pf aff & Kendall, t^}^ Newark, N. J. 



TO AVOID TROUBLE- Use 



FISHER STEAM SPECIALTIES 



LOOK for our ad in Jan. 12 issue 

 FISHER GOVERNOR CO. 



Home OflSce-MARSHALLTOWN, I A. 



Branches in Principal Cities. 



COAL COSTS 

 MONEY 



Are yon boming more than yon should . 



FREE ENGINEERINQ 



We maintain a staff of Combustion 

 Engineers who will come into your 

 plant, look it over and if we can cut 

 your coal bill we will tell you how 

 we can do it. There is no obliga- 

 tion to buy COKAL HAND STOKERS. 

 We will guarantee to save coal in 

 your plant if it is possible to do it. 



Call us up or write — 



Cokal Stoker Corporation 



1039 North Clark Streot I 



Tel. Sapcrior 7701 CHICAQO \ 



Mention The ReTlew when yon write. 



Union Grate i 



A Rocking Grate that Saves Coal \ 



Write for catalogue and prices -. 



MARTIN GRATE CO., ««s ^--bornst. 



CHICAGO 



j? 



